1. Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E California Blvd, Pasadena, California 91125, United States
2. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
3. University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
4. Research and Development, The Dow Chemical Company, Midland, Michigan 48674, United States